Top-seeded Lindsay Davenport retired in the first set of her opening match Thursday at the Bank of the West Classic with a lower back strain, the same injury that hampered her in the Wimbledon final earlier this month. Davenport, ranked No. 1 in the world and playing her first match since losing the longest Wimbledon women's final to Venus Williams, trailed 5-0 to Anna-Lena Groenefeld when the...